<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined('BASEPATH') or exit('No direct script access allowed');

/**
 * Config Class
 *
 * This class contains functions that enable config files to be managed
 *
 * @package CodeIgniter
 * @subpackage Libraries
 * @category Libraries
 * @author EllisLab Dev Team
 * @link https://codeigniter.com/user_guide/libraries/config.html
 */
class CI_Config
{

    /**
     * List of all loaded config values
     *
     * @var array
     */
    public $config = array();

    /**
     * List of all loaded config files
     *
     * @var array
     */
    public $is_loaded = array();

    /**
     * List of paths to search when trying to load a config file.
     *
     * @used-by CI_Loader
     * 
     * @var array
     */
    public $_config_paths = array(
        APPPATH
    );
    
    // --------------------------------------------------------------------
    
    /**
     * Class constructor
     *
     * Sets the $config data from the primary config.php file as a class variable.
     *
     * @return void
     */
    public function __construct()
    {
        $this->config = & get_config();
        
        // Set the base_url automatically if none was provided
        if (empty($this->config['base_url'])) {
            if (isset($_SERVER['SERVER_ADDR'])) {
                if (strpos($_SERVER['SERVER_ADDR'], ':') !== FALSE) {
                    $server_addr = '[' . $_SERVER['SERVER_ADDR'] . ']';
                } else {
                    $server_addr = $_SERVER['SERVER_ADDR'];
                }
                
                $base_url = (is_https() ? 'https' : 'http') . '://' . $server_addr . substr($_SERVER['SCRIPT_NAME'], 0, strpos($_SERVER['SCRIPT_NAME'], basename($_SERVER['SCRIPT_FILENAME'])));
            } else {
                $base_url = 'http://localhost/';
            }
            
            $this->set_item('base_url', $base_url);
        }
        
        log_message('info', 'Config Class Initialized');
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Load Config File
     *
     * @param string $file
     *            name
     * @param bool $use_sections
     *            values should be loaded into their own section
     * @param bool $fail_gracefully
     *            just return FALSE or display an error message
     * @return bool if the file was loaded correctly or FALSE on failure
     */
    public function load($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)
    {
        $file = ($file === '') ? 'config' : str_replace('.php', '', $file);
        $loaded = FALSE;
        
        foreach ($this->_config_paths as $path) {
            foreach (array(
                $file,
                ENVIRONMENT . DIRECTORY_SEPARATOR . $file
            ) as $location) {
                $file_path = $path . 'config/' . $location . '.php';
                if (in_array($file_path, $this->is_loaded, TRUE)) {
                    return TRUE;
                }
                
                if (! file_exists($file_path)) {
                    continue;
                }
                
                include ($file_path);
                
                if (! isset($config) or ! is_array($config)) {
                    if ($fail_gracefully === TRUE) {
                        return FALSE;
                    }
                    
                    show_error('Your ' . $file_path . ' file does not appear to contain a valid configuration array.');
                }
                
                if ($use_sections === TRUE) {
                    $this->config[$file] = isset($this->config[$file]) ? array_merge($this->config[$file], $config) : $config;
                } else {
                    $this->config = array_merge($this->config, $config);
                }
                
                $this->is_loaded[] = $file_path;
                $config = NULL;
                $loaded = TRUE;
                log_message('debug', 'Config file loaded: ' . $file_path);
            }
        }
        
        if ($loaded === TRUE) {
            return TRUE;
        } elseif ($fail_gracefully === TRUE) {
            return FALSE;
        }
        
        show_error('The configuration file ' . $file . '.php does not exist.');
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Fetch a config file item
     *
     * @param string $item
     *            name
     * @param string $index            
     * @return string|null configuration item or NULL if the item doesn't exist
     */
    public function item($item, $index = '')
    {
        if ($index == '') {
            return isset($this->config[$item]) ? $this->config[$item] : NULL;
        }
        
        return isset($this->config[$index], $this->config[$index][$item]) ? $this->config[$index][$item] : NULL;
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Fetch a config file item with slash appended (if not empty)
     *
     * @param string $item
     *            name
     * @return string|null configuration item or NULL if the item doesn't exist
     */
    public function slash_item($item)
    {
        if (! isset($this->config[$item])) {
            return NULL;
        } elseif (trim($this->config[$item]) === '') {
            return '';
        }
        
        return rtrim($this->config[$item], '/') . '/';
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Site URL
     *
     * Returns base_url . index_page [. uri_string]
     *
     * @uses CI_Config::_uri_string()
     *      
     * @param string|string[] $uri
     *            or an array of segments
     * @param string $protocol            
     * @return string
     */
    public function site_url($uri = '', $protocol = NULL)
    {
        $base_url = $this->slash_item('base_url');
        
        if (isset($protocol)) {
            // For protocol-relative links
            if ($protocol === '') {
                $base_url = substr($base_url, strpos($base_url, '//'));
            } else {
                $base_url = $protocol . substr($base_url, strpos($base_url, '://'));
            }
        }
        
        if (empty($uri)) {
            return $base_url . $this->item('index_page');
        }
        
        $uri = $this->_uri_string($uri);
        
        if ($this->item('enable_query_strings') === FALSE) {
            $suffix = isset($this->config['url_suffix']) ? $this->config['url_suffix'] : '';
            
            if ($suffix !== '') {
                if (($offset = strpos($uri, '?')) !== FALSE) {
                    $uri = substr($uri, 0, $offset) . $suffix . substr($uri, $offset);
                } else {
                    $uri .= $suffix;
                }
            }
            
            return $base_url . $this->slash_item('index_page') . $uri;
        } elseif (strpos($uri, '?') === FALSE) {
            $uri = '?' . $uri;
        }
        
        return $base_url . $this->item('index_page') . $uri;
    }
    
    // -------------------------------------------------------------
    
    /**
     * Base URL
     *
     * Returns base_url [. uri_string]
     *
     * @uses CI_Config::_uri_string()
     *      
     * @param string|string[] $uri
     *            or an array of segments
     * @param string $protocol            
     * @return string
     */
    public function base_url($uri = '', $protocol = NULL)
    {
        $base_url = $this->slash_item('base_url');
        
        if (isset($protocol)) {
            // For protocol-relative links
            if ($protocol === '') {
                $base_url = substr($base_url, strpos($base_url, '//'));
            } else {
                $base_url = $protocol . substr($base_url, strpos($base_url, '://'));
            }
        }
        
        return $base_url . $this->_uri_string($uri);
    }
    
    // -------------------------------------------------------------
    
    /**
     * Build URI string
     *
     * @used-by CI_Config::site_url()
     * @used-by CI_Config::base_url()
     *
     * @param string|string[] $uri
     *            or an array of segments
     * @return string
     */
    protected function _uri_string($uri)
    {
        if ($this->item('enable_query_strings') === FALSE) {
            is_array($uri) && $uri = implode('/', $uri);
            return ltrim($uri, '/');
        } elseif (is_array($uri)) {
            return http_build_query($uri);
        }
        
        return $uri;
    }
    
    // --------------------------------------------------------------------
    
    /**
     * System URL
     *
     * @deprecated 3.0.0 Encourages insecure practices
     * @return string
     */
    public function system_url()
    {
        $x = explode('/', preg_replace('|/*(.+?)/*$|', '\\1', BASEPATH));
        return $this->slash_item('base_url') . end($x) . '/';
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Set a config file item
     *
     * @param string $item
     *            key
     * @param string $value
     *            value
     * @return void
     */
    public function set_item($item, $value)
    {
        $this->config[$item] = $value;
    }
}
